检索结果-内蒙古大学图书馆

Two-dimension high efficiency beam steering based on liquid crystal polarization gratings

Optics Express 2025年第10期33卷 21425-21440页

作者： Li, Zifan Yu, Bijun Gong, Junhao Liu, Yutong Fan, Lina Gao, Xin Yin, Jiahang Ding, Tongshan Zhang, Dawei Wang, Jun Hong, Ruijin Mao, Hongmin Lu, Huanjun Cao, Zhaoliang Key Laboratory of Intelligent Optoelectronic Devices and Chips of Jiangsu Higher Education Institutions School of Physical Science and Technology Suzhou University of Science and Technology Suzhou215009 China Advanced Technology Research Institute of Taihu Photon Center School of Physical Science and Technology Suzhou University of Science and Technology Suzhou215009 China School of Optoelectronic Information and Computer Engineering University of Shanghai for Science and Technology Shanghai200093 China School of Electronics and Information Engineering Suzhou University of Science and Technology Jiangsu Suzhou215009 China

Cascaded liquid crystal polarization grating (LCPG) structure is commonly used to realize two-dimension large angle optical beam steering. In this architecture, different LCPGs have different incident angles. As a liquid crystal half-wave plate (LC HWP) is placed in front of the LCPG to control steering direction, the different incident angles will affect the phase modulation of LC HWP and then, decrease the steering efficiency. In this paper, the steering efficiency of cascaded LCPGs under tilt incidence is considered and a compensation method is proposed to increase the steering efficiency. A simple analysis model is established to calculate the steering efficiency of cascaded LCPG structure for tilt incidence with arbitrary direction. Further, the effect of tilt incidence on the phase modulation of LC HWP is compensated and a simple formula is given to compute the compensation voltage. A validation experiment is performed to verify the proposed method. All the simulated and experimental results indicate that the steering efficiency of cascaded LCPGs can be improved for two-dimension beam scanning. This work is helpful for high efficiency beam steering based on cascaded LCPGs. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Bragg gratings

来源：评论

学校读者我要写书评

暂无评论

Prediction of Cardiac Arrest using Generalized Soft Computing Techniques 18

Prediction of Cardiac Arrest using Generalized Soft Computin...

引用

18th INDIAcom;11th International Conference on Computing for Sustainable Global Development, INDIACom 2024

作者： Hota, Radhanath Dash, Sachikant Mishra, Sujogya Das, Subhalaxmi Lenka, S. Pradhan, G. Giet University Department of Computer Science Engineering Odisha Gunupur India Gandhi Institute for Education and Technology Department of Computer Science Engineering Odisha Gunupur India Odisha University of Technology and Research Department of Mathematics Bhubaneswar India Odisha University of Technology and Research Dept. of Computer Science and Engineering Bhubaneswar India Utkal University Department of Computer Science and Application Bhubaneswar India

ISBN: (纸本)9789380544519

Cardiac-related diseases always lead to fatal consequences around the globe. This research includes vague data analysis of the data related to cardiac anomalies. This study proposes a method to develop a dimension reduction model using vague data related to cardiac diseases using rough set theory (RST). The overall research is divided into two different sections. The first section of this study proposes analyses of the raw cardiac-related data using RST, and the second section calculates the performance accuracy using Principal Component Analysis (PCA) applied to the universal data set;the performance measures also include a combination of two Universal data sets. The above claims are verified using statistical tests © 2024 Bharati Vidyapeeth, New Delhi.

关键词： PCA Performance and accuracy Rough Set Theory Statistical method Vague data

来源：评论

学校读者我要写书评

暂无评论

Young's double slit interference with vortex source

引用

Chinese Physics B 2024年第1期33卷 395-399页

作者：段琦琳赵鹏飞殷玉杭陈焕阳 Institute of Electromagnetics and Acoustics and Department of Physics College of Physical Science and TechnologyXiamen UniversityXiamen 361005China Jiujiang Research Institute of Xiamen University Jiujiang 332000China Department of Electrical and Computer Engineering National University of Singapore117583Singapore

The fast and convenient demultiplex of optical vortex(OV) mode is crucial for its further application. We propose a novel approach that combines classic Young's doublet with an OV source to effectively identify the OV mode through the analysis of interference patterns. The interference patterns of the OV source incident on the double slits can be perfectly illustrated by using both the classical double-slit interference method and the Huygens–Fresnel principle. The interference fringes will twist along the negative or positive direction of x axis when topological charge(TC)l>0 or l<0, and the degree of the movement varies with the TC, allowing for a quantitative display of the OV characteristics through the interference patterns. Additionally, we deduce analytically that the zeroth-order interference fringe has a linear relationship with the TC and the vertical position. These findings highlight the ability to identify the OV mode by analyzing the interference patterns produced by Young's doublet.

关键词： Young's double slit vortex source inteference patterns

来源：评论

学校读者我要写书评

暂无评论

A Cost-Efficient Anonymous Authenticated and Key Agreement Scheme for V2I-Based Vehicular Ad-Hoc Networks

引用

IEEE Transactions on Intelligent Transportation Systems 2024年第9期25卷 12621-12630页

作者： Saleem, Muhammad Asad Li, Xiong Mahmood, Khalid Shamshad, Salman Alenazi, Mohammed J. F. Das, Ashok Kumar University of Electronic Science and Technology of China School of Computer Science and Engineering Chengdu611731 China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen518000 China National Yunlin University of Science and Technology Graduate School of Intelligent Data Science Yunlin Douliu64002 Taiwan The University of Lahore Department of Software Engineering Lahore54590 Pakistan King Saud University College of Computer and Information Sciences Department of Computer Engineering Riyadh11451 Saudi Arabia International Institute of Information Technology Center for Security Theory and Algorithmic Research Hyderabad500032 India

The rise of smart cities is directly connected to the increasing use of vehicles. The growing vehicle utilization has driven the emergence of Vehicular Ad-hoc Networks (VANETs), facilitating instant information exchange among vehicles. The system provides essential information regarding road conditions, traffic patterns, and more relevant data. VANETs encompass two fundamental categories of communication exchanges, namely Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I). V2I technology facilitates the integration of cars and transportation infrastructure, enabling effective communication between vehicles and infrastructure. Nevertheless, the potential of V2I communication has various security concerns arising from prevalent security threats. Current authentication techniques encounter challenges regarding complexity, security, and privacy considerations. We designed a hash-based lightweight and anonymous authentication scheme to address the aforementioned restrictions and enhance the effectiveness of authentication in V2I architecture. This scheme effectively combines identity, password, and bio-metric to enhance resistance against impersonation, denial of service, and privileged insider attacks. The devised scheme distinguishes itself by a comparative analysis and security proofs, highlighting its superior capability in guaranteeing secure authentication in V2I communication. The comprehensive security analysis conducted formally and informally showcases the robustness of the proposed solution against several threats. The performance evaluation results show that our scheme demonstrates a decrease in the computational cost of 51.40% approximately and a reduction in communication overhead of around 22.57%. These results establish the efficiency and scalability of the proposed scheme as a viable solution for V2I architecture. © 2000-2011 IEEE.

关键词： Vehicular ad hoc networks

来源：评论

学校读者我要写书评

暂无评论

Energy-aware resource management in fog computing for IoT applications: A review, taxonomy, and future directions

引用

Software - Practice and Experience 2024年第2期54卷 109-148页

作者： Hashemi, Sayed Mohsen Sahafi, Amir Rahmani, Amir Masoud Bohlouli, Mahdi Department of Computer Engineering Qeshm Branch Islamic Azad university Qeshm Iran Department of Computer Engineering South Tehran Branch Islamic Azad University Tehran Iran Future Technology Research Center National Yunlin University of Science and Technology Yunlin Douliou Taiwan Department of Computer Science and Information Technology Institute for Advanced Studies in Basic Sciences Zanjan Iran Research and Innovation Department Petanux GmbH Bonn Germany Zanjan Iran

The energy demand for Internet of Things (IoT) applications is increasing with a rise in IoT devices. Rising costs and energy demands can cause serious problems. Fog computing (FC) has recently emerged as a model for location-aware tasks, data processing, fast computing, and energy consumption reduction. The Fog computing model assists cloud computing in fast processing at the network's edge, which also exerts a vital role in cloud computing. Due to the fast computing in fog servers, different quality of service (QoS) approaches have been proposed in various sections of the fog system, and several quality factors have been considered in this regard. Despite the significance of QoS in Fog computing, no extensive study has focused on QoS and energy consumption methods in this area. Therefore, this article investigates previous research on the use and guarantee of Fog computing. This article reviews six general approaches that discuss the published articles between 2015 and late May 2023. The focal point of this paper is evaluating Fog computing and the energy consumption strategy. This article further shows the advantages, disadvantages, tools, types of evaluation, and quality factors according to the selected approaches. Based on the reviewed studies, some open issues and challenges in Fog computing energy consumption management are suggested for further study. © 2023 John Wiley & Sons Ltd.

关键词： Quality of service

来源：评论

学校读者我要写书评

暂无评论

research on optimization model of differentiated toll rate of expressway towards sustainable transportation development

Advances in Transportation Studies

引用

Advances in Transportation Studies 2024年 62卷 191-208页

作者： Zhu, Z. Zhang, X. Wei, Z. Liu, M. Yu, C. Wula, Z. Platform of Transport Technology Thinktank Research Institute of Highway Ministry of Transport Beijing100088 China School of Transportation Science and Engineering Beihang University Beijing100191 China School of Computer Science and Engineering Beihang University Beijing100191 China

To explore the basis and implementation effects of differential toll rate formulation for expressways, reduce the financial burden of expressway operators, and scientifically guide traffic flow, this study proposes an expressway differential toll rate optimization model. The model is demonstrated using two pilot sections of G25 and G1112 expressways in J province of China, where differential tolling is implemented. Based on the change characteristics of traffic flow and toll amount of the two pilot sections before and after differential tolling, we propose an optimization model of differential toll rate for expressways that maximizes the net revenue of expressway operators while minimizing individual travel impedance. The optimization model is solved using MATLAB, and an optimal differential toll rate scheme by road section, time period, and vehicle type is obtained. The evaluation of the model is based on the net revenue of highway operators and individual travel impedance. The findings reveal that the proposed optimal rate scheme improves the net revenue of road operators while reducing individual travel impedance compared to the original toll rate scheme. Specifically, the differential toll pilot sections of G25 and G1112 can increase net revenue by approximately Rmb25,000,000 and Rmb16,000,000 per month, respectively, and reduce vehicle travel impedance by about Rmb37 and Rmb32 per vehicle. The proposed model balances highway operator revenue with individual travel costs, leading to more sustainable and efficient expressway use, which benefits expressway transportation sustainability. © 2024, Aracne Editrice. All rights reserved.

关键词： Vehicles

来源：评论

学校读者我要写书评

暂无评论

Analysis of various Classification Techniques using CNN models for the Detection of Alzheimer's Disease using MRI images 14

Analysis of various Classification Techniques using CNN mode...

引用

14th International Conference on Computing Communication and Networking Technologies, ICCCNT 2023

作者： Hemkiran, S. Sudha Sadasivam, G. Pradeepa, T. Samukthaa, R.S. Ajay Raj, R. Psg Institute of Technology and Applied Research Department of Computer Science and Engineering Coimbatore India Psg College of Technology Department of Computer Science and Engineering Coimbatore India

ISBN: (纸本)9798350335095

Alzheimer's disease (AD) is a brain disorder that is associated with memory loss and is typically observed in elderly and aging individuals. This condition is irreversible in nature. Neural networks have shown better performance than traditional machine learning algorithms when it comes to analyzing high-dimensional data from Magnetic Resonance Images (MRI) brain images. This is an approach for processing such data. Detection of Alzheimer's disease is essential because the early treatment can control the progression of the disease in a slower pace. In this work, the proposed model used different models of convolutional neural networks (CNN) techniques to process the MRI images of the brain and classified them into different classes. The proposed model detects AD using neural network feature extraction and classification methods based on the pre-processed datasets. Here, in the proposed model, various algorithms such as Resnet-50, DenseNet-169 and Hyperparameter tuning of Convolutional Neural Network are utilized to find the better performing model in terms of accuracy when compared with other traditional techniques. © 2023 IEEE.

关键词： Image classification

来源：评论

学校读者我要写书评

暂无评论

Algae species classification based on few-shot learning: A case study of Macau freshwater 9

Algae species classification based on few-shot learning: A c...

引用

9th International Conference on Communication and Information Processing, ICCIP 2023

作者： Wang, Binbin Yuan, Anran Zou, Hailin Chen, Zijie Li, Jianqing School of Computer Science and Engineering Macau University of Science and Technology Taipa China School of Computer Science and Engineering Macau University of Science and Technology Zhuhai MUST Science & Technology Research Institute Taipa China

ISBN: (纸本)9798400708909

Harmful Algal Blooms (HAB), a significant environmental concern on a global scale, are damaging to ecosystem functions and pose challenges to environmental management. The key to HAB management is to classify the local representative species. However, the widespread adoption of automated monitoring devices such as the Imaging FlowCytobot (IFCB) is cost-prohibitive and often cannot be efficiently utilized. An algae classification algorithm based on transfer learning designed to classify local algal species with limited low-cost microscope-based algae images is developed to offer a cost-effective and practical solution for HAB management. The model is tested on the Macau representative freshwater algae dataset. The training process of the transfer learning model is based on the automatically captured open-source dataset and IFCB-based Hong Kong tropical algal dataset. The results demonstrated the exceptional performance of our method, achieving up to 100% accuracy in the classification of single algal species. Furthermore, when compared with commonly used deep learning models in experimental comparisons, our method exhibited superior performance. We also conducted ablation experiments on transfer learning, which validated the effectiveness of our transfer learning approach. © 2023 Copyright held by the owner/author(s)

关键词： Algae

来源：评论

学校读者我要写书评

暂无评论

A Comprehensive Approach to Groundwater Quality Prediction and Management in the State of Telangana, India, Using Stacking Ensemble Approach 4

A Comprehensive Approach to Groundwater Quality Prediction a...

引用

4th International Conference on Emerging Systems and Intelligent Computing, ESIC 2024

作者： Senapati, Chinmayee Patra, Kumar Janardan Swain, Satyaprakash Jayasingh, Suvendra Kumar Senapati, Swagatika Ray, Niranjan Kumar Siksha 'o' Anusandhan Deemed to Be University Institute of Technical Education and Research Department of Civil Engineering Bhubaneswar India Odisha University of Technology and Research Department of Computer Science and Engineering Bhubaneswar India Institute of Management of Information Technology Cuttack Bput Department of Computer Science and Engineering Odisha India Institute of Management of Information Technology Cuttack Bput Department of Computer Science and Engineering Odisha India Kiit Deemed to Be University School of Computer Engineering Bhubaneswar India

ISBN: (纸本)9798350349856

Groundwater, a vital resource for various purposes, faces increasing threats to its quality due to factors like overuse, pollution and climate change. In the semi-arid climate of the state of Telangana, India, exacerbated by intensive agricultural practices, groundwater quality is a significant concern. This study presents a machine learning-based approach for predicting and managing groundwater quality in Telangana, utilizing a stacking ensemble method. Our proposed approach combines decision trees (DT) with meta-models such as logistic regression, K-nearest neighbors (K-NN), Bayesian ridge regression (BRR) and random forest (RF). Trained on a comprehensive dataset from the Telangana Open Data portal (2018-2021), the stacking ensemble demonstrates superior performance, achieving an accuracy of 96.07%, surpassing the best individual model (DT) at 92.68%. It not only enhances predictive capabilities but also provides insights into the spatial distribution of groundwater quality, identifying areas vulnerable to contamination. These findings offer valuable information for policymakers, environmental scientists and water resource managers, guiding informed decision-making for sustainable water resource management in Telangana. This research contributes to the ongoing discourse on environmental conservation and the imperative for effective groundwater management. © 2024 IEEE.

关键词： Decision trees

来源：评论

学校读者我要写书评

暂无评论

Interpretation Mode of Spaceborne SAR Based on Analysis of Cognitive Needs 11th

Interpretation Mode of Spaceborne SAR Based on Analysis of C...

引用

11th China Conference on Command and Control, C2 2023

作者： Lanyu, Li Shouwei, Yang Nanjing Research Institute of Electronic Technology Nanjing210049 China School of Computer Science and Engineering Nanjing University of Science and Technology Nanjing210004 China

ISBN: (纸本)9789819990207

The intelligent interpretation of spaceborne SAR images is an important technical field for future remote sensing applications. However, due to the imaging defects of SAR itself, it is very difficult to divide the image interpretation samples. Command and control, as an important application field of image interpretation, has many cognitive scenarios. Based on the analysis of image usage requirements, this article calculates the information value of corresponding target samples under different application purposes through text analysis of relevant SAR image scientific literature, technical reports, etc., and uses this as the selection threshold for image interpretation to improve the efficiency of image interpretation. At the same time, this paper also designed a SAR image interpretation mode based on graph neural network, replacing the attention mechanism module with knowledge calibration, and providing technical support for the in-depth application of satellite-borne SAR. © Chinese institute of Command and Control 2024.

关键词： Synthetic aperture radar

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：